Certain Balance Sheet Components - Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Mar. 31, 2022
Other Liabilities Disclosure [Abstract]
Accrued sales discounts, rebates, and allowances	$ 25,290	$ 19,390
Accrued compensation-related expenses	13,094	26,389
Accrued income tax payable	8,784	720
Accrued R&D expenses	6,029	6,955
Accrued commercial expenses	5,099	7,196
Accrued other expenses	3,192	3,309
Accrued royalties payable to Takeda	3,082	2,470
Accrued professional fees	1,118	1,340
Deferred product revenue	0	825
Total accrued expenses and other current liabilities	$ 65,688	$ 68,594